Method for Transforming Nitrogen-Containing Compounds

Abstract

The invention relates to a method for the selective catalytic transformation of nitrogen-containing compounds. The transformation relates to the selective catalytic reduction (SCR) of nitrogen oxides, or the selective catalytic oxidation (SCO) of nitrogen hydrides and nitrogen-containing organic compounds, preferably in waste gas flows of combustion processes with motors and without motors and industrial applications. The catalytic converter comprises a titano-(silico)-alumo-phosphate.

1 . Method for the selective catalytic conversion of nitrogen-containing compounds in exhaust gas streams, wherein a catalyst that comprises titano-alumino-phosphate or titano-silico-alumino-phosphate is used. 
     
     
         2 . Method according to  claim 1 , wherein the conversion of nitrogen-containing compounds is the reduction of nitrogen oxides. 
     
     
         3 . Method according to  claim 2 , wherein NH 3 , urea, carbon monoxide or hydrocarbon compounds are used as reducing agent. 
     
     
         4 . Method according to  claim 1 , wherein the conversion of nitrogen-containing compounds is the oxidation of nitrogen-hydrogen compounds and/or nitrogen-containing organic compounds. 
     
     
         5 . Method according to  claim 4 , wherein oxygen-containing gases, air or laughing gas are used as oxidant. 
     
     
         6 . Method according to  claim 1 , wherein the titano-alumino-phosphate or titano-silico-alumino-phosphate has a BET surface area within the range of from 200 to 1200 m 2 /g. 
     
     
         7 . Method according to  claim 1 , wherein a catalyst that comprises titano-silico-alumino-phosphate is used. 
     
     
         8 . Method according to  claim 7 , wherein the titano-silico-alumino-phosphate is TAPSO-34. 
     
     
         9 . Method according to  claim 1 , wherein the titano-alumino-phosphate or titano-silico-alumino-phosphate is present modified with at least one transition metal cation. 
     
     
         10 . Method according to  claim 9 , wherein the titano-alumino-phosphate or titano-silico-alumino-phosphate modified with the at least one transition metal cation has the following formula:
   [(Ti x Al y Si z P q )O 2 ] −a [M b+ ] a/b ;   wherein the symbols and indices used have the following meanings: x+y+z+q=1; 0.010≦x≦0.110; 0.400≦y≦0.550; 0≦z≦0.090; 0.350≦q≦0.450; a=y−q; M b+  represents at least one transition metal cation with the charge b+, wherein b is an integer greater than or equal to 1.   
     
     
         11 . Method according to  claim 9 , wherein the at least one transition metal cation is a cation of a metal selected from the group consisting of iron, copper, chromium, manganese, cobalt, platinum, palladium, rhodium, silver and gold. 
     
     
         12 . Method according to  claim 9 , wherein the at least one transition metal cation present in the titano-alumino-phosphate or titano-silico-alumino-phosphate lies within the range of from 0.01 wt. % to 20 wt. % relative to the total weight of the titano-alumino-phosphate or titano-silico-alumino-phosphate. 
     
     
         13 . Method according to  claim 1 , wherein the titano-alumino-phosphate or titano-silico-alumino-phosphate has a (Ti)/(Al+P) molar ratio or (Si+Ti)/(Al+P) molar ratio within the range of from 0.01 to 0.5. 
     
     
         14 . Method according to  claim 1 , wherein the titano-silico-alumino-phosphate has an Si/Ti molar ratio within the range of from 0 to 20 and/or the titano-alumino-phosphate or titano-silico-alumino-phosphate has an Al/P ratio within the range of from greater than 1 to 1.5. 
     
     
         15 . Method according to  claim 1 , wherein the titano-alumino-phosphate or titano-silico-alumino-phosphate is present as full extrudate or on a support body in the form of a coating. 
     
     
         16 . Method according to  claim 1 , wherein the conversion takes place at a temperature within the range of from 50° C. to 550° C. 
     
     
         17 . Use of a titano-alumino-phosphate or titano-silico-alumino-phosphate for the selective catalytic conversion of nitrogen-containing compounds. 
     
     
         18 . Use of a titano-alumino-phosphate or titano-silico-alumino-phosphate for the production of an exhaust gas purification catalyst component. 
     
     
         19 . Exhaust gas purification catalyst component comprising a titano-alumino-phosphate or titano-silico-alumino-phosphate.